Part Number：12482063, CG777600LD. -There are 2 different valve seal styles for the LS motors: "Small" and "Top Hat". -These valve seals fit for the LS (4.8L, 5.3L, 5.7L, 6.0L, 6.2L & 7.0L GM) engines with. 313" stem valves and guide boss machined to. 500".
